1N4972US

Single Zener Diodes Overview

The Microchip Technology 1N4972US is a surface mount Zener voltage regulator with a nominal breakdown voltage of 39 V at a test current of 30 mA. It features a maximum dynamic impedance of 14 Ohms and a reverse leakage current of 2 µA. The device dissipates 5 Watts at an end cap temperature of 140°C, with a thermal resistance of 7°C/W from junction to end cap. It operates within a temperature range of -65°C to +175°C and has a voltage temperature coefficient of 0.095%/°C.

Single Zener Diodes Feature Summary

• Hermetically sealed voidless glass package with internal metallurgical bonds
• Military qualified to MIL-PRF-19500/356 for high-reliability applications
• Inherently radiation hard and non-sensitive to ESD per MIL-STD-750 Method 1020

Single Zener Diodes Applications

• High-reliability military systems where failure cannot be tolerated
• Voltage regulation over broad operating current and temperature ranges
• Radiation-hardened electronic circuits

Single Zener Diodes Procurement Notes

Verify the specific revision level and manufacturing origin against the latest official datasheet before procurement. Confirm that the ordering suffix matches the required tolerance and packaging specifications. Ensure compliance with all applicable export control classifications and environmental directives relevant to the intended deployment region.

Single Zener Diodes Selection Notes

Select this component when a 39 V reference is required in a surface mount configuration. Consider the 5 W power dissipation capability and the wide operating temperature range up to 175°C. Verify that the 14 Ohm dynamic impedance meets the circuit requirements for noise and stability.

Single Zener Diodes Part Context

This part belongs to the 1N4954US through 1N4996US series of 5 Watt Zener Voltage Regulators. These devices are industry-recognized components designed for robust performance in demanding environments. They utilize a square MELF-style package identified as D-5B or E package.

Single Zener Diodes Replacement Considerations

Equivalent axial-leaded versions exist under the 1N4972 designation without the US suffix. Other parts in the series offer different voltage ratings but share similar construction and qualification standards.